The menstrual month: how to exercise effectively at every stage of your cycle

The physiological changes that take place around a woman’s period can affect her training. Experts assess when to take it easy – and when you should go hard

When Evgenia Koroleva started learning about her menstrual cycle and the effect it was having on her, week to week, she says: “It blew my mind. Why did I know so little about my body?” A gym owner, Koroleva has since created a training programme based around an individual’s cycle, which she says will optimise results frontline cf.

Hers is not the first to take the menstrual cycle into consideration when it comes to exercise. Interest has grown hugely in recent years, with elite athletes tracking physiological changes and coaches educating themselves about the effects. For the rest of us, there are apps and cycle trackers, but the area is still woefully under-researched (blame male-dominated medicine and sport).

There are also a lot of conflicting results, while almost half of the existing studies are low quality, says Kelly Lee McNulty, a PhD student at Northumbria University, who is investigating the effects of the menstrual cycle on performance, adaptation and recovery. “While performance and training based on the menstrual cycle is such an interesting concept, and very popular at the moment, there’s not enough published high-quality evidence,” she says. (There is even less on the impact of hormonal contraception on exercise performance, so where we refer here to the menstrual cycle, it is for women who are not on the pill or using an implant.) However, there are generalities that could be helpful for some women. Here is how your cycle may be affecting your workout.

Get to know your cycle

The 28-day cycle is split into two halves – follicular and luteal, either side of ovulation. Very broadly, taking a 28-day cycle as the textbook example, McNulty defines the most-relevant phases as early follicular (days one to five), with low oestrogen and progesterone; late follicular (days six to 12), with high oestrogen and low progesterone; and mid-luteal (days 20 to 23), with high oestrogen and progesterone. “Women are so different; we experience our menstrual cycles differently and a blanket approach is not going to work for everyone,” she says. Collect your own data, she advises – there are numerous apps, but a notebook is fine – “and then look for patterns”. If one week you can blitz a high-intensity workout and the next you can barely make it through, it doesn’t mean your fitness has gone backwards. If your motivation is suffering, it doesn’t mean you are a failure. It could all simply be hormonal. “Then you’ve got hormone fluctuations daily, so it all becomes more complex,” McNulty says.

Try exercising through the symptoms

“There are more than 150 symptoms, like breast pain, headaches and nausea … potentially, that’s a time to decrease training if you’re not feeling it,” says McNulty. “But then it’s also been shown that moderate-intensity exercise, like yoga, is beneficial for premenstrual symptoms.” Around days three to five of your period, oestrogen starts to increase, “so you might be starting to feel better and up for exercise around that time”. Koroleva says: “Training on your period is a good way to offset your symptoms.”

Push yourself up to week three …

In the late follicular and the mid-luteal phases, oestrogen is higher. McNulty says one of its many effects is to help build muscle mass. “This is when we can really push female bodies,” says Koroleva. “For the first three weeks, we push you in terms of strength training and add cardio to it. Our bodies don’t have a huge amount of testosterone, but it rises during ovulation and this makes it an ideal time to really push, because of the energy levels.” This is the time when you might set your personal bests and “sail through high-intensity training”, she says. However, it is not a given. “In that mid-luteal phase, progesterone rises; that has its own physiological effects, so you might not notice that difference,” she says. “It’s just being aware of what might work for you.”

… but be wary of injury around ovulation time

There is some evidence that, when oestrogen is high, around the late follicular phase, there is an increased risk of injury, because the hormone makes ligaments and tendons more lax. For instance, an injury to the anterior cruciate ligament (in the knee) may be more likely. “It’s something to be aware of, but I would never say not to train,” says McNulty. “But if you know this phase might have certain increased injury risks, you could warm up better.”